我试图在FreeBSD 10.1-RELEASE上从libxml ++构建示例代码，但是我在链接库时遇到undefined reference to Glib::...错误。
在CentOS 6.5和7.0上编译时没有错误。
启用链接器详细模式时，似乎找到了所有glib库。
我尝试重新安装glib库几次，但没有任何改变。
有关编译失败的建议吗？
下面的源代码和makefile。
main.cc：
#include <libxml++/libxml++.h> #include <iostream> void print_indentation(unsigned int indentation) { for (unsigned int i = 0; i < indentation; ++i) std::cout << " "; } void print_node(const xmlpp::Node* node, unsigned int indentation = 0) { std::cout << std::endl; //Separate nodes by an empty line. const xmlpp::ContentNode* nodeContent = dynamic_cast<const xmlpp::ContentNode*>(node); const xmlpp::TextNode* nodeText = dynamic_cast<const xmlpp::TextNode*>(node); const xmlpp::CommentNode* nodeComment = dynamic_cast<const xmlpp::CommentNode*>(node); if (nodeText && nodeText->is_white_space()) //Let's ignore the indenting - you don't always want to do this. return; Glib::ustring nodename = node->get_name(); if (!nodeText && !nodeComment && !nodename.empty()) //Let's not say "name: text". { print_indentation(indentation); std::cout << "Node name = " << node->get_name() << std::endl; std::cout << "Node name = " << nodename << std::endl; } else if (nodeText) //Let's say when it's text. - e.g. let's say what that white space is. { print_indentation(indentation); std::cout << "Text Node" << std::endl; } //Treat the various node types differently: if (nodeText) { print_indentation(indentation); std::cout << "text = \"" << nodeText->get_content() << "\"" << std::endl; } else if (nodeComment) { print_indentation(indentation); std::cout << "comment = " << nodeComment->get_content() << std::endl; } else if (nodeContent) { print_indentation(indentation); std::cout << "content = " << nodeContent->get_content() << std::endl; } else if (const xmlpp::Element* nodeElement = dynamic_cast<const xmlpp::Element*>(node)) { //A normal Element node: //line() works only for ElementNodes. print_indentation(indentation); std::cout << " line = " << node->get_line() << std::endl; //Print attributes: const xmlpp::Element::AttributeList& attributes = nodeElement->get_attributes(); for (xmlpp::Element::AttributeList::const_iterator iter = attributes.begin(); iter != attributes.end(); ++iter) { const xmlpp::Attribute* attribute = *iter; print_indentation(indentation); std::cout << " Attribute " << attribute->get_name() << " = " << attribute->get_value() << std::endl; } const xmlpp::Attribute* attribute = nodeElement->get_attribute("title"); if (attribute) { std::cout << "title found: =" << attribute->get_value() << std::endl; } } if (!nodeContent) { //Recurse through child nodes: xmlpp::Node::NodeList list = node->get_children(); for (xmlpp::Node::NodeList::iterator iter = list.begin(); iter != list.end(); ++iter) { print_node(*iter, indentation + 2); //recursive } } } int main(int argc, char* argv[]) { std::string filepath; if (argc > 1) filepath = argv[1]; //Allow the user to specify a different XML file to parse. else filepath = "example.xml"; try { xmlpp::DomParser parser; parser.set_validate(); parser.set_substitute_entities(); //We just want the text to be resolved/unescaped automatically. parser.parse_file(filepath); if (parser) { //Walk the tree: const xmlpp::Node* pNode = parser.get_document()->get_root_node(); //deleted by DomParser. print_node(pNode); } } catch (const std::exception& ex) { std::cout << "Exception caught: " << ex.what() << std::endl; } return 0; }
生成文件：
OBJDIR=.obj OBJS_MAIN = $(OBJDIR)/main.o OBJS_ALL = $(OBJS_MAIN) default: ao3 CC = g++48 #CENTOS_VERSION=$(shell sed 's/[^0-9]*\([0-9]*\)\.\([0-9]\).*/\1\2/' < /etc/redhat-release ) CENTOS_VERSION=70 CFLAGS_GS = -DWITH_OPENSSL -DWITH_GZIP -DWITH_CDATA -D CENTOS_VERSION=$(CENTOS_VERSION) -pthread # -Wl,--verbose OFLAGS= \ -Wl,--verbose \ -L/usr/local/lib \ -L "/usr/lib64/mysql" \ -L "/usr/lib/mysql" \ -L "/usr/local/lib/mysql" \ -L "/usr/lib64" \ -L "/usr/lib" \ -L "/usr/share/axiscpp/lib" \ -L "/usr/local/axis/lib" \ -L "/usr/local/lib/amadeus_2_1_39_5" \ -lboost_iostreams \ -lboost_date_time \ -lmysqlclient \ -lxml++-2.6 \ -lxml2 \ -lglibmm-2.4 \ -lgobject-2.0 \ -lgmodule-2.0 \ -lglib-2.0 \ -lloki \ -liconv\ -lpcre \ -lsigc-2.0 \ -lSockets \ -lssl \ -lintl \ -lffi \ -llzma \ -lpthread \ -lexpat \ -lbz2 \ -lglib \ -lz \ -luuid \ -lthr \ -lc++ \ -lm \ -lcxxrt \ -lgcc_s \ -lc ifeq ($(CENTOS_VERSION),65) OFLAGS += -lboost_system endif ifeq ($(CENTOS_VERSION),70) OFLAGS += -lboost_system OFLAGS += -lcrypto OFLAGS += -lboost_filesystem endif EXTCFLAGS := -g LDFLAGS= -L/usr/local/lib # -Weffc++ CFLAGS= $(EXTCFLAGS) \ -Wall \ -Werror \ -Wextra \ -D LARGEFILE64_SOURCE \ -D FILE_OFFSET_BITS=64 \ -D _UP_UNIX_ \ -D CNT_VERSION=2_3 \ -D LOKI_OBJECT_LEVEL_THREADING \ -D CENTOS_VERSION=$(CENTOS_VERSION) \ -isystem"/usr/include/" \ -isystem"/usr/local/include/" \ -isystem"/usr/include/libxml++-2.6" \ -isystem"/usr/local/include/libxml++-2.6" \ -isystem"/usr/local/include/libxml++-2.6/include" \ -isystem"/usr/lib/libxml++-2.6/include" \ -isystem"/usr/local/lib/libxml++-2.6/include" \ -isystem"/usr/lib64/libxml++-2.6/include" \ -isystem"/usr/include/glibmm-2.4" \ -isystem"/usr/local/include/glibmm-2.4" \ -isystem"/usr/lib/glibmm-2.4/include" \ -isystem"/usr/local/lib/glibmm-2.4/include" \ -isystem"/usr/lib64/glibmm-2.4/include" \ -isystem"/usr/local/include/glib-2.0/" \ -isystem"/usr/include/glib-2.0/" \ -isystem"/usr/lib/glib-2.0/include" \ -isystem"/usr/local/lib/glib-2.0/include" \ -isystem"/usr/lib64/glib-2.0/include" \ -isystem"/usr/lib/glib/include" \ -isystem"/usr/lib64/glib/include" \ -isystem"/usr/local/include/glib-1.2" \ -isystem"/usr/include/mysql" \ -isystem"/usr/local/include/mysql" $(OBJDIR)/%.o: %.cc @mkdir -p $(@D) $(CC) -MMD -MP -c $(CFLAGS) $(INCLUDE) -o $@ $< @echo -n '.' >> "$(DOTSFILE)" @curr=`wc -c < $(DOTSFILE)`; max=`cat $(MAXFILE)`; echo -e "\033[1m$$curr/$$max\033[0m" $(OBJDIR)/main.o: main.cc @mkdir -p $(OBJDIR) $(CC) -MMD -MP -c $(CFLAGS) $(INCLUDE) -o $@ $< -include $(OBJS_ALL:.o=.d) DOTSFILE := /dev/null MAXFILE := /dev/null help: @echo 'ao3, test, profile, clean, cleantest, cleanprofile' @echo 'CentOS version: '$(CENTOS_VERSION) ao3: $(OBJS_ALL) $(CC) --verbose -o ao3 -Wl,--start-group $(OBJS_ALL) $(OFLAGS) -Wl,--end-group test: $(OBJS_TEST_ALL) $(CC) -o ao3_test $(OBJS_TEST_ALL) $(OFLAGS) profile: $(OBJS_PROFILE_ALL) $(CC) -o ao3_profile $(OBJS_PROFILE_ALL) $(OFLAGS) clean: rm -f $(wildcard $(OBJS_ALL) ao3 $(OBJS_ALL:.o=.d)) find $(OBJDIR) -type d -empty -delete cleantest: rm -f $(wildcard $(OBJS_TEST) ao3_test $(OBJS_TEST:.o=.d)) find $(OBJDIR) -type d -empty -delete cleanprofile: rm -f $(wildcard $(OBJS_PROFILE) ao3_profile $(OBJS_PROFILE:.o=.d)) find $(OBJDIR) -type d -empty -delete
答案 0 :(得分：1)
所以问题是glibmm是由clang编译的，而我正在使用gcc进行编译。当使用c ++而不是g ++ 48进行编译时，它可以正常工作。